Much has been written of the history of Jaeger-LeCoultre, but little has been said of the complex history that gave us this unusual name. How did an Alsatian immigrant to Paris come to be so closely connected to one of the most famous watchmaking families of the Vallée de Joux? This is the story of the partnership between Edmond Jaeger and Jacques-David LeCoultre, and those that helped them to become Jaeger-LeCoultre, including a group of French aviation pioneers and a Swiss daredevil with a famous family name.